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Quarterly Financial Data (Unaudited) - Additional Disclosures (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
May. 31, 2015 | Feb. 28, 2015 | Nov. 30, 2014 | Aug. 31, 2014 | May. 31, 2014 | Feb. 28, 2014 | Nov. 30, 2013 | Aug. 31, 2013 | May. 31, 2015 | May. 31, 2014 | May. 31, 2013
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |
Service revenue | $ 681.4 | $ 693.6 | $ 665.9 | $ 656.6 | $ 628.8 | $ 639.9 | $ 606.4 | $ 603.1 | $ 2,697.5 | $ 2,478.2 | $ 2,285.2
Total revenue | $ 692.2 | 704.3 | 676.3 | 666.8 | $ 639.0 | $ 650.4 | $ 616.4 | $ 613.1 | $ 2,739.6 | $ 2,518.9 | $ 2,326.2
Scenario, Previously Reported [Member] |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |
Service revenue |  | 626.0 | 600.5 | 597.9 |  |  |  |  |  |  |
Total revenue |  | $ 636.5 | $ 610.5 | $ 607.9 |  |  |  |  |  |  |

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